206872495210921 has 2 divisors, whose sum is σ = 206872495210922. Its totient is φ = 206872495210920.

The previous prime is 206872495210907. The next prime is 206872495210939. The reversal of 206872495210921 is 129012594278602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191595427240000 + 15277067970921 = 13841800^2 + 3908589^2 .

It is a cyclic number.

It is not a de Polignac number, because 206872495210921 - 2⁷ = 206872495210793 is a prime.

It is not a weakly prime, because it can be changed into another prime (206872495210021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103436247605460 + 103436247605461.

It is an arithmetic number, because the mean of its divisors is an integer number (103436247605461).

Almost surely, 2^{206872495210921} is an apocalyptic number.

It is an amenable number.

206872495210921 is a deficient number, since it is larger than the sum of its proper divisors (1).

206872495210921 is an equidigital number, since it uses as much as digits as its factorization.

206872495210921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 206872495210921 in words is "two hundred six trillion, eight hundred seventy-two billion, four hundred ninety-five million, two hundred ten thousand, nine hundred twenty-one".